Very well said. The entire case made for shemitah / jubilee is simple conspiracy-mongering. Some event happened close to a certain religious holiday therefore one caused the other. It's as scientific as astrology.
If you want to prove these links of causation then set up a rigorous test for it.

As it is you could likely choose any arbitrary dates and JB would say, "Oh that was within a week of X bank failing and within a Month of Y dictator toppling."
The world is a big place with things constantly happening. If you're going to link events happening weeks apart you can pretty much connect anything to a pattern real or imagined.